Monthly climate guide
Olbia weather in September
September in Olbia is typically warm, with average daytime highs around 27°C (80°F) and night-time lows near 19°C (65°F). The month usually brings about 46 mm of rain (fairly dry) and is a mix of sun and cloud. Daytime highs are 4°C cooler than August and 4°C warmer than October.
What stands out in September
- Outdoor swimming weather: around 27°C, mostly dry and sunny.
- Just 110 km apart, but Olbia runs about 2°C warmer than Alghero this month.
- September brings early autumn to Olbia.
- It cools down fast from here: October is about 4°C cooler.
Avg high
27°C
80°F
Avg low
19°C
65°F
Rainfall
46 mm
fairly dry
Humidity
68%
relative
Sky
40%
cloud · a mix of sun and cloud
Olbia weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 13°C / 55°F | 7°C / 44°F | 60 mm | 81% | 63% |
| February | 13°C / 56°F | 6°C / 44°F | 56 mm | 79% | 59% |
| March | 16°C / 60°F | 8°C / 47°F | 57 mm | 77% | 58% |
| April | 19°C / 67°F | 10°C / 51°F | 44 mm | 74% | 55% |
| May | 22°C / 72°F | 13°C / 56°F | 37 mm | 71% | 48% |
| June | 28°C / 82°F | 18°C / 64°F | 15 mm | 65% | 29% |
| July | 31°C / 88°F | 21°C / 69°F | 8 mm | 61% | 18% |
| August | 31°C / 89°F | 21°C / 70°F | 11 mm | 60% | 19% |
| September | 27°C / 80°F | 19°C / 65°F | 46 mm | 68% | 40% |
| October | 23°C / 73°F | 15°C / 59°F | 54 mm | 75% | 47% |
| November | 18°C / 64°F | 11°C / 53°F | 87 mm | 81% | 60% |
| December | 14°C / 58°F | 8°C / 47°F | 48 mm | 81% | 56% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
Is September a good time to visit Olbia?
Compare the months in the chart above to find your ideal window.
Best time to visit Olbia →Other Italy cities in September
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Olbia weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/italy/olbia/september
<a href="https://weathercompare.eu/weather/italy/olbia/september">Olbia weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/italy/olbia" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Olbia weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/italy/olbia/september">Olbia weather in September</a> – WeatherCompare</p>
Olbia in September: quick answers
Is September a good time to visit Olbia?
September is a reasonable time for Olbia: highs around 27°C and about 46 mm of rain, though not one of the three best months.
How warm is Olbia in September?
Average highs are about 27°C (80°F) and average lows about 19°C (65°F), based on 10 years of daily data.
Does it rain a lot in Olbia in September?
Olbia typically gets around 46 mm of rain in September — fairly dry.
Figures are long-term averages for the area around Olbia (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.